Does this look weird to anyone??


Noticed it after a track event during the weekend. It's usually black inside the tips, but noticed it looked a little gray. Only mods are a 5/16 spacer, Nismo exhaust, Ultimate Racing HFC, and pop charger.

 

i guess this indicates lean conditions

 

I was thinking this also, but there is still black stuff on the edge of the tips and back of my car. It wasnt spitting out and visable smoke though.

I have no idea why it would be running lean with only a couple of mods.

 

Did you run race gas? It looks like its race gas residue on your exhaust tip.

 

you need NXT metal polysh

 

imo, that's a tell-tale sign of a lean condition... esp. since you said that it appeared after a track event (i.e. sustained high rpms)

 

Doesnt the Z run rich up top?

 

it does stock... but with his mods:

"5/16 spacer, Nismo exhaust, Ultimate Racing HFC, and pop charger"

I would think he's a tad lean... I can't say for certain though because obviously every car is different.

Axelerate - May I suggest pulling a plug and taking a look to see if a lean condition really IS causing your problems?

 

hey, that's normal, if you ask me.. just happens when you run your z super hard. it comes off with a degreaser.. just let it sit for a few minutes then wipe.

 

I remember seing a highly modded supra and WRX with white residue on the tips.

But i have no clue what your problem could be.

 

It's perfectly fine. In fact, the color of your exhaust pipe on the inside is akin to reading plugs. Look inside the header of a real race car. It will be the same color if not a little lighter. I was unable to see your picture BTW. I wouldn't worry about it at all though.

 

light grey is good. light tan is lean

 

Seems to me like a couple of hours washing that thing wouldnt hurt.

G

 

Oh it's clean now!

I took that at the track before I left.

Thanks for the replies.

I checked for any exhaust leaks or plenum leaks and found none, and I reset the ECU also. Car feels the same and hasnt felt down on power so I think it's fine.

Now that I'm back to driving normal it seems to be darking up again.

 

as asked above, were you running race fuel? 110 perhaps?

on a side note, are you coming to the mini-meet this Saturday?

 

Looks just like you ran a tank of C16 though your car. happends to all cars that run it

 

I work Saturdays until 7, so if it's still going on then I can.

About the race fuel, I filled up at the pumps at VIR and I cant rmember which grade I used. So it is possible I filled up with something other than 93. It's all so damn expensive and I was in a hurry to get ready for my session.

 

I would tend to agree that is was probably race fuel and not a big deal. I used to run 116 all the time and my tail pipes looked like that.

I am trying to set up a first meeting for the whole Z club thing, hope you will be able to make it.

 

those appear on my RX-8, but (hopefully) not my Z